1. Write a sentence that describes

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1 1. Write a sentence that describes
this chemical reaction. Na(s) + H2O(l) NaOH(aq) + H2(g) Sodium metal and water react to form sodium hydroxide and hydrogen gas.

2 2. Sulfur burns in oxygen to form sulfur
dioxide. Write a skeleton equation for this chemical reaction. Include appropriate symbols from table 11.1. S(s) + O2(g) SO2(g)

3 #3 Balance each equation. a. AgNO3 + H2S Ag2S + HNO3
First try balancing the silver, Then balance the hydrogen Balanced! On each side: 2 Ag 2 NO3 2 H 1 S

4 #3 Balance each equation.
b. Zn(OH) H3PO Zn3(PO4)2 + H2O 3 2 6 First try balancing the zinc, Then balance the PO4 then balance the hydrogen Balanced! On each side: 3 Zn 2 PO4 12 H 6 O

5 no coefficients needed
4. Rewrite these word equations as balanced chemical equations. a. hydrogen + sulfur hydrogen sulfide b. iron (III) chloride + calcium hydroxide iron (III) hydroxide + calcium chloride H2 (g) S(s) H2S(g) no coefficients needed 2 3 2 3 FeCl Ca(OH) Fe(OH) CaCl2

6 #5 Balance each equation:
3 3 a. FeCl NaOH Fe(OH) NaCl 3 b. CS Cl CCl S2Cl2

7 #6 Write and balance this equation:
calcium hydroxide + sulfuric acid calcium sulfate + water Ca(OH) H2SO CaSO4 + H2O 2

8 To write a word equation you need to
#7 Key Concept How do you write a word equation? example: calcium hydroxide + sulfuric acid calcium sulfate + water To write a word equation you need to include the names of the reactants (left) and products (right) on either side of an arrow showing the direction of the reaction.

9 To write a skeleton equation you need to
#8 Key Concept How do you write a skeleton equation? example: Ca(OH) H2SO CaSO4 + H2O To write a skeleton equation you need to include the correct formulas for the the reactants (left) and products (right) of an arrow showing the direction of the reaction. This is NOT BALANCED YET

10 example: Ca(OH)2 + H2SO4 CaSO4 + H2O
#9 Key Concept Describe the steps in writing a balanced chemical equation. example: Ca(OH) H2SO CaSO4 + H2O 2 1. Write out the correct formulas for each compound in the reaction on both sides of an arrow. 2. Add coefficients when needed in FRONT of the compounds to give the same # and types of elements on both sides of the equation.

11 ∆ ∆ #10. Write skeleton equations for these reactions: not balanced
a. Heating copper (II) sulfide in the presence of diatomic oxygen produces pure copper and sulfur dioxide gas. ∆ CuS(s) O2(g) Cu(s) SO2 (g) b. When heated, baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, and water. ∆ NaHCO3 (s) Na2CO3(s) + CO2 (g) + H2O(g)

12 ∆ ∆ a. Fes) + Cl2(g) FeCl3(s) b. Al2(CO3)3 (s) Al2O3 + CO2(g)
#11 Write and balance equations for the fol- lowing reactions: Iron metal and chlorine gas react to form solid iron (III) Chloride. ∆ a. Fes) Cl2(g) FeCl3(s) 2 3 2 Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas. ∆ b. Al2(CO3)3 (s) Al2O CO2(g) 3

13 #11 Write and balance equations for the fol-
lowing reactions: Solid magnesium reacts with aqueous silver nitrate to form silver and aqueous magnesium c. Mg(s) + AgNO3(aq) Ag(s) + Mg(NO3)2(s) 2 2

14 b. Fe2O3 (s) + H2(g) Fe(s) + H2O(g)
#12 Write and balance equations for the fol- lowing reactions: a. SO2(s) O2(g) SO3(s) 2 2 b. Fe2O3 (s) + H2(g) Fe(s) H2O(g) 3 2 3 c. P(s) O2(g) P4O10(s) 4 5 d. Al(s) N2(g) AlN(s) 2 2